package tmooc._0505;


import java.util.Random;
import java.util.Scanner;

public class demo04 {

    public static void main(String[] args) {
        String a =  generateVeriCode(2);
        Scanner scan = new Scanner(System.in);
        System.out.println(a);

        /*
        String a =  generateVeriCode(2);
        Scanner scan = new Scanner(System.in);
        System.out.println(a);
*/
        /*
        String a =  generateVeriCode(2);
        Scanner scan = new Scanner(System.in);
        System.out.println(a);
        */

    }


    /*
     public static String generateVeriCode(int len){
        String code ="";
        Random rand = new Random();
        char[] chs= {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','B','Q','R','S','T',
                    'U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o',
                     'b','q','r','s','t','u','v','w','x','y','z','0','1','2','3','4','5','6','7','8','9'
        };

        for(int i = 1 ; i<=len ; i++){
            int index = rand.nextInt(chs.length);
            code  += chs[index];
        }
        return code;
    }
     */

    /*
     public static String generateVeriCode(int len){
        String code ="";
        Random rand = new Random();
        char[] chs= {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','B','Q','R','S','T',
                    'U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o',
                     'b','q','r','s','t','u','v','w','x','y','z','0','1','2','3','4','5','6','7','8','9'
        };

        for(int i = 1 ; i<=len ; i++){
            int index = rand.nextInt(chs.length);
            code  += chs[index];
        }
        return code;
    }
     */


     public static String generateVeriCode(int len){
        String code ="";
         Random rand = new Random();
        char[] chs= {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','B','Q','R','S','T',
                    'U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o',
                     'b','q','r','s','t','u','v','w','x','y','z','0','1','2','3','4','5','6','7','8','9'
        };

        for(int i = 1 ; i<=len ; i++){
            int index = rand.nextInt(chs.length);
            code  += chs[index];
        }
        return code;
    }


}
